Display device, vehicle-mounted system, and vehicle

Abstract

A display device (500), a vehicle-mounted system, and a vehicle. The display device (500) has excellent characteristics of low color cast and uniform light emission, thereby improving the quality of display images, and thus improving user experience. The display device (500) is provided with two phase compensation elements (530, 560) orthogonal within a slow axis plane and two polarization optical elements (520, 570) having a same polarization direction, so that the total phase retardation of light of each wavelength and each polarization direction emitted from the display device (500) can be ensured to be basically the same; and light of different wavelengths can all be well restored to linearly polarized light, thereby achieving the effect of light emission having low color cast.

Description

Display device, vehicle-mounted system and vehicle TECHNICAL FIELD

[0001] The present application relates to the technical field of display and the technical field of intelligent automobile driving, and more particularly, to a display device, a vehicle-mounted system and a vehicle. BACKGROUND

[0002] Virtual image display devices such as augmented reality (AR) and virtual reality (VR) have become popular science and technology products in recent years, and the optical components thereof mainly include an image generation module, an optical imaging module and a view window module. The image generation module outputs an image source, the image source is imaged by the imaging module and then projected to the human eye, and the view window module generally participates in imaging and also undertakes the functions of protection and light extinction. At present, the optical imaging module and the view window module generally have color deviation problems, and therefore how to realize uniform light emission color and low color deviation of the virtual image display device is a problem to be solved.

[0003] SUMMARY

[0004] The present application provides a display device, a vehicle-mounted system and a vehicle. The display device provided by the present application has excellent characteristics of low color deviation and uniform light emission, improves the quality of a displayed image, and thus achieves the effect of improving user experience.

[0005] In a first aspect, an embodiment of the present application provides a display device. The display device comprises: an image generation module, a first polarized optical element, a first phase compensation element, an optical imaging module and a view window module, the view window module comprising a second phase compensation element and a second polarized optical element, the first polarized optical element and the first phase compensation element being located on an optical path between the image generation module and the view window module, the polarization directions of the first polarized optical element and the second polarized optical element being the same, and the slow axis of the first phase compensation element and the slow axis of the second phase compensation element being in-plane orthogonal, wherein the image generation module is configured to output image light; the first polarized optical element is configured to generate first linearly polarized light based on the image light and output the first linearly polarized light to the first phase compensation element; the first phase compensation element is configured to generate first circularly polarized light based on the first linearly polarized light; the optical imaging module is configured to output second circularly polarized light or the image light to the view window module, the second circularly polarized light being generated based on the first circularly polarized light; the second phase compensation element is configured to generate second linearly polarized light based on the second circularly polarized light; the second polarized optical element is configured to transmit the second linearly polarized light; and the view window module is configured to output the second linearly polarized light.

[0006] Based on the above scheme, the display device provided in the application introduces the first phase compensation element and the first polarized optical element, and sets the slow axis direction of the first phase compensation element to be orthogonal to the slow axis direction of the second phase compensation element in the window module, so that the light of each wavelength and each polarization direction in the input image light can ensure that the total phase delay is basically consistent, and at the same time, the light of different wavelengths can be well restored to linearly polarized light and exit through the second polarized optical element, thereby realizing the effect of low color deviation light emission.

[0007] With reference to the first aspect, in some implementations of the first aspect, the window module includes a first substrate and a second substrate, the material of the first substrate and the material of the second substrate are the same, and the polar direction of the material of the first substrate and the polar direction of the material of the second substrate are arranged at a right angle.

[0008] By arranging the polar directions of the first substrate and the second substrate at a right angle, the phase difference caused by factors such as temperature and stress can be compensated, thereby ensuring the uniformity of the light emission color of the display device and reducing the color deviation of the light emission.

[0009] With reference to the first aspect, in some implementations of the first aspect, the material of the first substrate and the material of the second substrate are polycarbonate (PC) or polymethyl methacrylate (PMMA).

[0010] Using common materials such as PC or PMMA makes the design of the window module simple and easier to process.

[0011] With reference to the first aspect, in some implementations of the first aspect, the first polarized optical element, the first phase compensation element, and the image generation module are integrated into one whole, wherein the window module is specifically configured to reflect the first circularly polarized light to generate third circularly polarized light and emit the third circularly polarized light to the optical imaging module, and the polarization direction of the second linearly polarized light emitted by the window module is parallel to the polarization direction of the first linearly polarized light; and the optical imaging module is specifically configured to reflect the third circularly polarized light to generate the second circularly polarized light and emit the second circularly polarized light to the window module.

[0012] With reference to the first aspect, in some implementations of the first aspect, the first polarizing optical element, the first phase compensation element, and the image generation module are integrated into one whole, wherein the optical imaging module is specifically configured to transmit the first circularly polarized light to the view window module, and reflect the third circularly polarized light from the view window module to generate the second circularly polarized light, and emit the second circularly polarized light to the view window module; the second phase compensation element is further configured to generate third linearly polarized light based on the first circularly polarized light, and emit the third linearly polarized light to the second polarizing optical element, the third linearly polarized light being parallel to the polarization direction of the first linearly polarized light, and generate third circularly polarized light based on the third linearly polarized light, and emit the third circularly polarized light to the optical imaging module; the second polarizing optical element is further configured to reflect the third linearly polarized light to the second phase compensation element; and the second linearly polarized light emitted by the view window module is perpendicular to the polarization direction of the first linearly polarized light.

[0013] With reference to the first aspect, in some implementations of the first aspect, the first polarizing optical element, the first phase compensation element, and the view window module are integrated into one whole, and the view window module further includes a three-way film, the three-way film being arranged between the first phase compensation element and the second phase compensation element, wherein the optical imaging module is specifically configured to transmit the image light to the view window module; the three-way film is configured to transmit the first circularly polarized light to the second phase compensation element, and reflect the first circularly polarized light to the first phase compensation element; the first phase compensation element is further configured to generate third linearly polarized light based on the first circularly polarized light, the third linearly polarized light being perpendicular to the polarization direction of the first linearly polarized light; and the second linearly polarized light emitted by the view window module is parallel to the polarization direction of the first linearly polarized light.

[0014] In a second aspect, an embodiment of the present application provides a vehicle-mounted system. The vehicle-mounted system includes the display device provided in the first aspect or any implementation manner of the first aspect, and a seat, wherein the seat is configured to allow a user to sit on the seat to watch the image displayed by the display device.

[0015] In a third aspect, an embodiment of the present application provides a vehicle. The vehicle includes the display device in some implementation manners of the first aspect and a windshield glass, wherein the windshield glass is configured to reflect the second linearly polarized light from the display device to a human eye.

[0016] In a fourth aspect, an embodiment of the present application provides a vehicle. The vehicle includes the display device provided in the first aspect or any implementation manner of the first aspect, or the vehicle includes the vehicle-mounted system in the implementation manner of the second aspect. Attached Figure Description

[0017] Figure 1 is a functional block diagram of a vehicle 100 to which this application embodiment applies.

[0018] Figure 2 is a schematic diagram of an application scenario of an intelligent cockpit display system 200 applicable to an embodiment of this application.

[0019] Figure 3 is a schematic diagram of another application scenario of the intelligent cockpit display system 300 applicable to the embodiments of this application.

[0020] Figure 4 is a schematic diagram of the HUD device application scenario applicable to the embodiments of this application.

[0021] Figure 5 is a schematic structural diagram of a display device 500 provided in an embodiment of this application.

[0022] Figure 6 is a schematic diagram of the structure of an image generation module 510 applicable to an embodiment of this application.

[0023] Figure 7 is a structural schematic diagram of the first type of window module 700 provided in the embodiments of this application.

[0024] Figure 8 is a structural schematic diagram of the second type of window module 800 provided in the embodiment of this application.

[0025] Figure 9 is a schematic structural diagram of the first type of display device 900 for vehicle display provided in this application.

[0026] Figure 10 is a schematic structural diagram of the second type of display device 1000 for vehicle display provided in this application.

[0027] Figure 11 is a schematic structural diagram of the third type of display device 1100 for vehicle display provided in this application.

[0028] Figure 12 is a schematic diagram of the cockpit of a vehicle provided in an embodiment of this application.

[0029] Figure 13 is a schematic diagram of the optical path 1300 of the display device provided in the embodiment of this application applied to a HUD device.

[0030] Figure 14 is a circuit diagram of the display device provided in an embodiment of this application.

[0031] Figure 15 is a schematic diagram of a possible functional framework of a means of transportation provided in an embodiment of this application. Detailed Implementation

[0032] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0033] The following description is provided to facilitate understanding of the embodiments of this application.

[0034] First, in the following description of the embodiments of the present application or in the terms in the drawings, "first", "second", and the like and various numerical numbers are merely used for the convenience of description to distinguish, and do not have to be used to describe a specific order or sequence, and do not limit the scope of the embodiments of the present application. For example, the first polarizing optical element, the second polarizing optical element, and the like are used to distinguish different polarizing optical elements.

[0035] Second, the terms "include" and "have" and any variations thereof in the following description of the embodiments of the present application are intended to cover the inclusions not the exclusions, for example, a process, a method, a system, a product, or an apparatus including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, the method, the product, or the apparatus.

[0036] Third, in the embodiments of the present application, the words "exemplarily" or "for example" and the like are used to represent an example, an illustration, or a description, and the embodiments or design schemes described as "exemplarily" or "for example" should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. The words "exemplarily" or "for example" and the like are intended to present the relevant concepts in a specific manner for the convenience of understanding.

[0037] Fourth, in the embodiments of the present application, the image light refers to light carrying an image (or image information), which is used to generate an image, and can also be referred to as imaging light.

[0038] Fifth, in the drawings of the present application, the thickness, size, and shape of each optical element have been slightly exaggerated for the convenience of description. Specifically, the shape of the optical element shown in the drawings is shown by way of example, for example, the shape of the diffusion screen in the present application is not limited to the shape shown in the drawings. Moreover, the drawings are merely examples and are not drawn strictly according to the scale.

[0039] Sixth, unless otherwise defined, all the terms (including technical terms and scientific terms) used in the present application have the same meaning as commonly understood by those skilled in the art to which the present application belongs. It should also be understood that the terms (for example, the terms defined in a commonly used dictionary) should be interpreted as having a meaning consistent with the meaning in the context of the relevant technology, and should not be interpreted in an idealized or overly formal sense, unless otherwise clearly defined herein.

[0040] Seventh, the wave plate in the embodiments of the present application, also known as a phase retardation plate, is a birefringent crystal with a certain thickness, such as a quartz crystal. The wave plate can cause a relative phase delay between the two perpendicular polarization components of the polarized light, thereby changing the polarization characteristics of the light. The wave plate mainly includes a quarter wave plate (QWP) and a half wave plate (HWP). Among them, the QWP is also called 1 / 4 wave plate. When the light is normally incident through the QWP, the ordinary light (o light) and the extraordinary light (e light) produce an odd multiple of π / 2 phase delay. When linearly polarized light is normally incident to the 1 / 4 wave plate, and the polarization of the light and the optical axis of the wave plate are at an angle of θ, the outgoing linearly polarized light becomes elliptical polarized light. In particular, when θ = ± 45°, the outgoing light is circularly polarized light.

[0041] It can be understood that the embodiments described in the present application are only a part of the embodiments of the present application, not all the embodiments. Those skilled in the art can know that with the development of technology and the emergence of new scenes, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0042] Currently, virtual image display devices such as AR and VR are being widely applied in various industries, such as intelligent driving, and are constantly developing and innovating. FIG. 1 is a functional block diagram of a vehicle 100 to which the embodiments of the present application are applicable. Specifically, the vehicle 100 can include a perception system 120, a display device 130, and a computing platform 150. Among them, the perception system 120 can include one or more sensors that sense information about the environment around the vehicle 100. For example, the perception system 120 can include a positioning system, which can be a global positioning system (GPS), a Beidou system, or other positioning systems. For another example, the perception system 120 can include one or more of an inertial measurement unit (IMU), a laser radar, a millimeter wave radar, an ultrasonic radar, and a camera device.

[0043] Part or all of the functions of the vehicle 100 can be controlled by the computing platform 150. The computing platform 150 can include one or more processors, such as processor 151, processors 152 to 15n (n is a positive integer), which are circuits having a processing capability of signals. In one implementation, the processor can be a circuit having an instruction reading and running capability, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP), etc. In another implementation, the processor can implement certain functions through a logical relationship of hardware circuits, which is fixed or can be reconfigured, such as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD) implemented hardware circuit, such as a field programmable gate array (FPGA). In the reconfigurable hardware circuit, the processor loads a configuration document to implement the hardware circuit configuration, which can be understood as the process of the processor loading instructions to implement the functions of the above part or all units. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc. In addition, the computing platform 150 can also include a memory for storing instructions, and part or all of the processors 151 to 15n can call the instructions in the memory and execute the instructions to implement corresponding functions. It can be understood that the display device and the vehicle-mounted system provided in the embodiments of the present application can be applied to the vehicle as shown in FIG. 1. Among them, the display device provided in the embodiments of the present application can be an example of the display device 130 in FIG. 1, such as the display device 500 in the following embodiments, which can be the display device 130 shown in FIG. 1, or included in the display device 130, that is, all or part of the display device 130 shown in FIG. 1 has the structure and function of the display device in the embodiments of the present application. In addition, the display device provided in the present application can be applied to a left-hand drive vehicle, and can also be applied to a right-hand drive vehicle. The embodiments of the present application do not limit the type of vehicle.

[0044] The vehicle 100 can also be a vehicle including a cabin as shown in FIG. 2 and / or FIG. 3. Among them, FIG. 2 is a schematic diagram of an application scene of an intelligent cabin display system 200 applicable to the embodiments of the present application. As shown in FIG. 2, the intelligent cabin display system 200 includes at least one display device 101 and at least one seat 102, and FIG. 2 is an example in which one display device and one seat are shown, and the display device 101 is arranged on the back of the seat 102. Among them, the display device 101 can generate an enlarged virtual image at a far distance image plane through the input of an external video signal (also referred to as a signal source), provide a large-format, long-distance visual experience for the viewer, and meet the needs of users in various application scenarios such as leisure and entertainment, business office, etc.

[0045] It should be noted that the display device 101 can also be installed on the headrest of the seat 102. Alternatively, when the intelligent cabin display system also includes an instrument panel, the display device 101 can also be installed on the instrument panel, as shown in the cabin system 300 of FIG. 3. When the display device 101 is installed on the instrument panel 202, the display device 101 can also be designed to be capable of being stored in the instrument panel 202, at this time, the shell of the display device 101 can be designed and shaped in reference to the shape and color of the instrument panel, achieving perfect unity with the appearance of the instrument panel 202, and achieving the purpose of considering the beauty of the cabin system 300. In order to further improve the intelligent effect of the cabin system, in the system 300, the posture and position information of the user can also be detected by a detector after obtaining the authorization consent of the user, and the automatic display of the display device 101 can be realized according to the posture and position information of the user. For example, when it is detected that the user is located in front of the instrument panel 202 or the eyes of the user look at the display device 101, the display device 101 can automatically rise from the instrument panel 202 or slide out, and after being automatically adjusted to a suitable position and angle, the display of the image is performed.

[0046] It should also be noted that in the embodiments of the present application, the display device 101 can be installed on the back of the seat 102, the headrest or the instrument panel 202 before leaving the factory. Alternatively, it can also be installed on the back of the seat 102, the headrest or the instrument panel 202 after leaving the factory by modifying the seat 102, the headrest or the instrument panel 202, and the present application does not make any limitation.

[0047] It can be understood that the intelligent cabin display systems 200 and 300 shown in FIGS. 2 and 3 are only examples, and the intelligent cabin system applicable to the embodiments of the present application can also include an intelligent steering wheel, etc. That is, the intelligent cabin display system applicable to the embodiments of the present application is not limited to the one shown in FIG. 2 or FIG. 3, but can also be other systems containing the intelligent cabin display system 200 or 300 shown in FIG. 2 or FIG. 3 or other systems similar to FIG. 2 or FIG. 3, and the present application does not make any limitation.

[0048] FIG. 4 is a schematic diagram of an application scenario of a HUD device to which the embodiments of the present application are applicable. As shown in FIG. 4, the HUD device is arranged on a vehicle. The HUD device is used to project the state information of the vehicle, the indication information of external objects and the navigation information, etc. through the windshield of the vehicle into the field of view of the driver. The state information includes but is not limited to the driving speed, the driving mileage, the fuel amount, the water temperature, the state of the vehicle lights and the like. The indication information of external objects includes but is not limited to the safe distance, the surrounding obstacles, the reversing image and the like. The navigation information includes but is not limited to the direction arrow, the distance and the driving time and the like.

[0049] The virtual image corresponding to the navigation information and the indication information of external objects can be superimposed on the real environment outside the vehicle, so that the driver can obtain the visual effect of augmented reality, for example, which can be used for AR navigation, adaptive cruise, lane departure warning and the like. Since the virtual image corresponding to the navigation information can be combined with the real scene, the HUD device is usually cooperated with the advanced driving assistant system (ADAS) system of the vehicle.

[0050] It should be noted that the HUD device provided in the above FIG. 4 is a single focal plane display, but the present application is not limited thereto, i.e. the HUD device to which the embodiments of the present application are applicable can also be a HUD device in a multi-focal plane application scenario and the like.

[0051] It can be understood that the above application scenarios are all described by taking the application of the embodiments of the present application to a vehicle as an example. The vehicle is a vehicle in a broad sense, which can be a traffic tool (such as a commercial vehicle, a passenger vehicle, a train and the like), a recreational device, a toy vehicle and the like, and the type of the vehicle is not limited specifically in the embodiments of the present application. The application scenarios to which the embodiments of the present application are applicable include but are not limited to a road traffic tool, a water traffic tool, an air traffic tool or an entertainment device and the like, for example, which can be a driving tool such as an airplane or a ship and the like.

[0052] In addition, the display device provided in the present application can also be applied to other display systems, i.e. the above FIG. 2 to FIG. 4 are only the vehicle application scenarios to which the embodiments of the present application are applicable, but the application scenarios of the embodiments of the present application include but are not limited to a vehicle display system.

[0053] The optical assembly of the virtual image display device mainly includes an image generation module, an optical imaging module and a view window module. In order to improve the imaging quality, the virtual image display device generally adds a polarized optical element and a phase compensation element in the view window module to reduce the reflection and glare of ambient light introduced by the optical imaging module, and to achieve a better one-piece black effect. However, the introduction of the polarized optical element and the phase compensation element will cause the generated image to have color deviation problems, which will also cause the image quality to decrease. In addition, in some application scenarios, in order to avoid the generation of splashes when the substrate of the view window module is subjected to collision, or to achieve a special surface modeling to cope with glare, the substrate of the view window module usually adopts a plastic material such as optical polycarbonate (PC) or polymethyl methacrylate (PMMA). However, PC or PMMA and other materials have a serious birefringence problem, which will produce an additional phase difference, which will also cause the display picture to have color deviation.

[0054] In view of this, the present application proposes a display device, which pre-compensates the image light emitted by the image generation module, thereby reducing the color deviation problem in the display image. In addition, for the scenario where PC or PMMA and other materials are used as the substrate of the view window module, the "orthogonal pre-compensation" scheme is adopted to further improve the light emission uniformity of the display device, reduce the color deviation of the display image, and achieve the effect of improving the display picture quality.

[0055] FIG. 5 is a schematic structural diagram of a display device 500 provided in an embodiment of the present application. As shown in FIG. 5, the display device 500 includes an image generation module 510, a first polarized optical element 520, a first phase compensation element 530, an optical imaging module 540, and a view window module 550. The view window module 550 includes a second phase compensation element 560 and a second polarized optical element 570. The first polarized optical element 520 and the first phase compensation element 530 are located on an optical path between the image generation module 510 and the view window module 550. The polarization directions (may also be referred to as polarization directions) of the first polarized optical element 520 and the second polarized optical element 570 are the same, and the slow axis of the first phase compensation element 530 and the slow axis of the second phase compensation element 560 are in-plane orthogonal. Specifically, the image generation module 510 is configured to emit image light. The first polarized optical element 520 is configured to generate first linearly polarized light based on the image light, and emit the first linearly polarized light to the first phase compensation element 530. The first phase compensation element 530 is configured to generate first circularly polarized light based on the first linearly polarized light. The optical imaging module 540 is configured to emit second circularly polarized light or image light to the view window module 550, the second circularly polarized light being generated based on the first circularly polarized light. The second phase compensation element 560 is configured to generate second linearly polarized light based on the second circularly polarized light, and emit the second linearly polarized light to the second polarized optical element 570. The second polarized optical element 570 is configured to transmit the second linearly polarized light. The view window module 550 is configured to emit the second linearly polarized light.

[0056] It should be noted that, in the present application, in-plane orthogonal means that, when viewed from the light emission direction, a space rectangular coordinate system 1 of the first phase compensation element 530 is established, wherein the normal direction of the first phase compensation element 530 (also the light emission direction) is the positive direction of the X1 axis, the absorption axis of the first polarized optical element 520 is the direction of the Y1 axis, the surface of the first phase compensation element 530 is the Y1Z1 plane, and the angle between the slow axis of the first phase compensation element 530 and the positive direction of the Y1 axis is angle 1. Similarly, when viewed from the light emission direction, a space rectangular coordinate system 2 of the second phase compensation element 560 is established, wherein the normal direction of the second phase compensation element 560 (also the light emission direction) is the positive direction of the X2 axis, the absorption axis of the second polarized optical element 570 is the direction of the Y2 axis, the surface of the second phase compensation element 560 is the Y2Z2 plane, and the angle between the slow axis of the second phase compensation element 560 and the positive direction of the Y2 axis is angle 2. If the absolute value of angle 1 and the absolute value of angle 2 differ by 90° (or 70°-110°), it means that the slow axis of the first phase compensation element 530 and the slow axis of the second phase compensation element 560 are in-plane orthogonal.

[0057] Based on the above scheme, by arranging the first phase compensation element and the second phase compensation element with their slow axes perpendicular to each other in the display device, the light of each wavelength in the image light can sequentially pass through the first phase compensation element and the second phase compensation element, so as to ensure that the total phase delay is basically consistent, thereby the light of different wavelengths can be well restored to the second linearly polarized light with the same polarization direction as the first linearly polarized light after passing through the second polarization element, so as to realize low color deviation light emission.

[0058] It should be noted that, in the present application, the polarization directions of the first polarization optical element 520 and the second polarization optical element 570 are the same, which means that the optical axis (absorption axis or reflection axis) of the first polarization optical element 520 and the optical axis (absorption axis or reflection axis) of the second polarization optical element 570 are arranged to be in-plane parallel. Among them, the in-plane parallel can be understood as follows: if plane 1 is the plane where the first polarization optical element 520 is located, and plane 2 is the plane where the second polarization optical element 570 is located, if the optical axis of the first polarization optical element 520 after projection is parallel to the optical axis of the second polarization optical element 570, then the optical axis of the first polarization optical element 520 and the optical axis of the second polarization optical element 570 are in-plane parallel. It can be understood that when the polarization directions of the first polarization optical element 520 and the second polarization optical element 570 are the same, when the same incident light is incident on the first polarization optical element 520 and the second polarization optical element 570, the polarization directions (also called vibration directions) of the first polarized light and the second polarized light generated by the first polarization optical element 520 and the second polarization optical element 570 are the same. For example, when left-handed circularly polarized light is incident on the first polarization optical element 520 and the second polarization optical element 570, if the first polarization optical element 520 generates first linearly polarized light, then the second polarization optical element 570 generates second linearly polarized light.

[0059] In the scheme of the present application, the polarization directions of the first linearly polarized light and the second linearly polarized light can be selected and designed according to the use scene of the display device and the structural design of the display device. The first linearly polarized light and the second linearly polarized light can be both horizontal linearly polarized light, or the first linearly polarized light and the second linearly polarized light can be both vertical linearly polarized light, or the first linearly polarized light and the second linearly polarized light can be linearly polarized light in mutually orthogonal directions, or can be linearly polarized light in other directions. Generally, the polarization direction parallel to the ground can be understood as horizontal polarization, and the polarization direction perpendicular to the ground can be understood as vertical polarization. That is, in the scheme of the present application, the polarization directions of the first linearly polarized light and the second linearly polarized light can be the same or different, which is related to the structure of the display device, the types of the first polarizing optical element 520 and the second polarizing optical element 570, and the incident light incident on the first polarizing optical element 520 and the second polarizing optical element 570.

[0060] It can also be understood that the scheme of the present application does not limit the implementation of the first polarizing optical element 520 and the second polarizing optical element 570. The first polarizing optical element 520 and / or the second polarizing optical element 570 can be a polarizer or a prism, etc. When the first polarizing optical element 520 and the second polarizing optical element 570 are polarizers, the first polarizing optical element 520 and / or the second polarizing optical element 570 can be a transmissive polarizer or a reflective polarizer. For example, when the first polarizing optical element 520 and the second polarizing optical element 570 are transmissive polarizers, the absorption axis of the first polarizing optical element 520 and the absorption axis of the second polarizing optical element 570 are arranged to be in-plane parallel.

[0061] It should be further noted that the scheme of the present application does not limit the implementation of the first phase compensation element 530 and the second phase compensation element 560. The first phase compensation element 530 and the second phase compensation element 560 can be at least one wave plate, phase compensation film, prism or holographic optical diffraction element, etc. In the description of the following embodiments of the present application, a 1 / 4 wave plate is taken as an example for illustration.

[0062] In the scheme of the present application, the second circularly polarized light is generated based on the first circularly polarized light, and the generation process can be at least one reflection and / or at least one transmission. Among them, reflection will change the rotation direction of the circularly polarized light, and transmission will not change the rotation direction of the circularly polarized light. It can be understood that when the first circularly polarized light undergoes an odd number of reflections, the rotation direction of the generated second circularly polarized light is opposite to that of the first circularly polarized light. When the first circularly polarized light undergoes an even number of reflections, the rotation direction of the generated second circularly polarized light is the same as that of the first circularly polarized light. The present application does not limit whether the rotation directions of the first circularly polarized light and the second circularly polarized light are the same. When the rotation directions of the first circularly polarized light and the second circularly polarized light are different, the second circularly polarized light is generated by the first circularly polarized light undergoing an odd number of reflections and / or at least one transmission. When the rotation directions of the first circularly polarized light and the second circularly polarized light are the same, the second circularly polarized light is generated by the first circularly polarized light undergoing an even number of reflections and / or at least one transmission. It can also be understood that when the rotation directions of the first circularly polarized light and the second circularly polarized light are the same, if the second circularly polarized light is generated by the first circularly polarized light transmitting a certain optical component, it can also be understood that the second circularly polarized light and the first circularly polarized light are the same beam of light. It should be noted that in the present application, the rotation direction of the circularly polarized light refers to the rotation of the electric field vector in the plane perpendicular to the propagation direction during the propagation of the circularly polarized light. Among them, the electric field vector rotates counterclockwise along the propagation direction when it is left-handed circularly polarized light, and the electric field vector rotates clockwise along the propagation direction when it is right-handed circularly polarized light. For the convenience of introduction, it is simply referred to as the rotation direction of the circularly polarized light.

[0063] It should be noted that in the scheme of the present application, the first polarizing optical element 520 and the first phase compensation element 530 are located on the light path between the image generation module 510 and the view window module 550. In some embodiments, the first polarizing optical element 520, the first phase compensation element 530 and the image generation module 510 are integrated into one whole, at this time, the first polarizing optical element 520 and the first phase compensation element 530 can be arranged in sequence on the light-out surface of the image generation module 510. Illustratively, when the first polarizing optical element 520 is a polarizer and the first phase compensation element 530 is a 1 / 4 wave plate, the polarizer and the 1 / 4 wave plate can be pasted on the light-out surface of the image generation module 510 by optical transparent glue. In other embodiments, the first polarizing optical element 520 and the first phase compensation element 530 are integrated into one whole, which can be called extinction unit for example, at this time, the extinction unit is arranged as a separate optical module on the light path between the image generation module 510 and the view window module 550. Illustratively, when the first polarizing optical element 520 is a polarizer and the first phase compensation element 530 is a 1 / 4 wave plate, the polarizer and the 1 / 4 wave plate can be pasted together to constitute the extinction unit. In yet other embodiments, the first polarizing optical element 520 and the first phase compensation element 530 can also be arranged as separate individual elements on the light path between the image generation module 510 and the view window module 550. In addition, in yet other embodiments, the first polarizing optical element 520, the first phase compensation element 530 and the view window module 550 are integrated into one whole, at this time, the first polarizing optical element 520 and the first phase compensation element 530 can be arranged in sequence on the light-receiving surface of the view window module 550. Illustratively, when the first polarizing optical element 520 is a polarizer and the first phase compensation element 530 is a 1 / 4 wave plate, the polarizer and the 1 / 4 wave plate can be pasted on the surface of the view window module 550 by optical transparent glue.

[0064] FIG. 6 is a structural schematic diagram of an image generation module 510 suitable for embodiments of the present application. As shown in FIG. 6, the image generation module 510 includes a light source 511, a modulation unit 512, and a projection module 513. When the display device 500 is in operation, the light source 511 is configured to provide a light beam carrying image information. The modulation unit 512 is configured to modulate the light beam emitted by the light source to generate image light according to the image information, i.e., the modulation unit 512 causes the light output from the modulation unit 512 to carry image information. The projection module 513 is configured to emit the image light carrying image information from the image generation module 510. It should be noted that FIG. 6 is only one of the structures of the image generation module 510 suitable for embodiments of the present application, i.e., the image generation module 510 suitable for embodiments of the present application is not limited to that shown in FIG. 6. In other embodiments, the image generation module 510 suitable for embodiments of the present application can also include a collimating module, a light homogenizing module, a diffusion screen, etc., which are not limited by the present application.

[0065] In addition, the scheme of the present application does not limit the implementation of the image generation module 510, which can be a liquid crystal display (LCD), a liquid crystal on silicon (LCOS) display, a light emitting diode (LED) display, an organic light-emitting diode (OLED) display, a Micro light emitting diode (Micro-LED) display, a display using mini light emitting diode (mini-LED) display technology, a display using digital light procession (DLP) technology projection, or a display using micro-electro-mechanical systems (MEMS) technology, etc.

[0066] Optionally, the optical imaging module 540 includes one or more optical elements for generating a virtual image, such as a mirror, a lens, etc., which are not limited by the present application. The number and / or type of optical elements included in the optical imaging module 540 can be determined according to specific application scenarios or design requirements.

[0067] In the present application, the window module 550 can also be referred to as a window sheet (Windows), optical window, window, window unit, etc. The window module 550 is a transparent window used in an optical system, which can allow light to enter or exit the system. The main function of the window module 550 is to integrate virtual images or information into the field of view of the real world. By overlaying or embedding virtual content within the user's field of view, an interactive and augmented reality experience is provided. In addition, the window module 550 can also be used to separate the environments on both sides, such as separating the inside and outside of the display device, so that the inside and outside of the display device are isolated from each other, thereby protecting the internal devices. That is, while allowing light to pass through, it also plays a role in preventing contamination, maintaining a vacuum, preventing oxidation, etc., such as the dust cover in the HUD device can serve as the window module of the HUD device. It does not change the optical magnification and only affects the optical path in the optical path.

[0068] It should be noted that the present application does not limit the number of substrates (or can be referred to as a base material) included in the window module 550. Next, two kinds of window modules provided by the embodiments of the present application will be exemplarily described in combination with the window module 700 in FIG. 7 and the window module 800 in FIG. 8. Among them, the window module 700 includes one substrate, that is, the first substrate 710 in FIG. 7, and the window module 800 includes two substrates, that is, the first substrate 810 and the second substrate 820 in FIG. 8.

[0069] FIG. 7 is a structural schematic diagram of a first window module 700 provided by the embodiments of the present application, and it can be understood that the window module 700 is an example of the window module 550. As shown in FIG. 7, the window module 700 includes a first substrate 710. Optionally, the material of the first substrate 710 is inorganic glass, for example, silica S iO2, borosilicate glass BK7, or the like. Alternatively, the material of the first substrate 710 is a thermoplastic plastic, for example, a polypropylene (PP) material, a PMMA material, a PC material, or the like. Alternatively, the material of the first substrate 710 is another material, for example, a triacetyl cellulose (TAC) material, or the like, which is not limited in the present application. When the material of the first substrate 710 is a PC material, the strength, impact resistance, and heat resistance of the window module 700 can be improved. When the material of the first substrate 710 is a PMMA material, the transparency of the window module 700 can be improved, and the weight of the window module 700 can be reduced. It should be noted that the present application does not limit the positions of the second phase compensation element 560 and the second polarizing optical element 570 relative to the first substrate 710 in the window module 700. In some embodiments, the second phase compensation element 560 and the second polarizing optical element 570 are disposed on one side surface of the first substrate 710, as shown in (a) of FIG. 7 and (b) of FIG. 7. Alternatively, in other embodiments, the second phase compensation element 560 and the second polarizing optical element 570 are disposed on opposite side surfaces of the first substrate 710, as shown in (c) of FIG. 7.

[0070] For a kind of organic glass material in thermoplastic plastic, such as PC material and PMMA material, etc., due to the arrangement of molecular chain in production process is uneven or stress, etc., optical anisotropy is generated in the material, the refractive index of incident light is different in different directions, birefringence phenomenon is generated, and then when user directly or indirectly watches virtual image picture through view window module, there is obvious color cast in virtual image picture.Therefore, for the view window module of substrate material needing to use organic glass, in order to reduce the color cast of display picture, reach the purpose of improving imaging quality, Fig.8 is the structural schematic diagram of the second view window module 800 provided in the embodiment of the present application, it can be understood that the view window module 800 is an example of the view window module 550.As shown in Fig.8, the view window module 800 includes two substrates, which are first substrate 810 and second substrate 820, wherein the polar direction of the material of the first substrate 810 and the second substrate 820 is arranged at right angle. Optionally, the material of the first substrate 810 and the second substrate 820 is PC material, or the material of the first substrate 810 and the second substrate 820 is PMMA material. It should be noted that the relative position of the second phase compensation element 560 and the second polarized optical element 570, the first substrate 810 and the second substrate 820 in the view window module 800 is not limited in the present application. In some embodiments, if the first substrate 810 and the second substrate 820 are arranged adjacent, at this time, the second phase compensation element 560 and the second polarized optical element 570 are arranged on the surface of the first substrate 810, which is the surface of the first substrate 810 not in contact with the second substrate 820, as shown in (a) of Fig.8; or the second phase compensation element 560 and the second polarized optical element 570 are arranged on the surface of the second substrate 820, which is the surface of the second substrate 820 not in contact with the first substrate 810, as shown in (b) of Fig.8; or the second phase compensation element 560 and the second polarized optical element 570 are arranged on the surface of the first substrate 810 and the surface of the second substrate 820 respectively, which are the surfaces of the second substrate 820 not in contact with the first substrate 810, as shown in (c) of Fig.8. In other embodiments, if the first substrate 810 and the second substrate 820 are arranged at intervals, at this time, the second phase compensation element 560 can be arranged between the first substrate 810 and the second substrate 820, as shown in (d) of Fig.8; or the second polarized optical element 570 can be arranged between the first substrate 810 and the second substrate 820, as shown in (e) of Fig.8.It can be understood that FIG. 8 is only an example of the second circularly polarized light passing through the first substrate 810 first and then passing through the second substrate 820. In other embodiments, the second circularly polarized light can pass through the second substrate 820 first and then pass through the first substrate 810. At this time, the second phase compensation element 560 and the second polarizing optical element 570 can also refer to (a) to (e) in FIG. 8, which will not be described here.

[0071] It can be understood that in the scheme of the present application, the number of substrates included in the window module 550 can be at least one. When the number of substrates included in the window module 550 is more than one, the multiple substrates can be divided into a group two by two, for example, two adjacent substrates, and the material polarity of the two substrates in the group is set to be orthogonal.

[0072] Based on the above scheme, by using the double organic glass substrate architecture with the polar direction perpendicular to each other in the window module of the display device, the change of the polar direction of the light when passing through the two layers of materials can be compensated for each other, that is, the superposition of the two orthogonal directions will make the polarization effect of the incident light in the two directions offset each other, thereby reducing or eliminating the birefringence effect of the material, effectively reducing the color deviation of the display picture, and achieving the purpose of improving the display picture quality.

[0073] The above, in combination with FIGS. 6 to 8, the various modules and structures of the display device 500 provided in FIG. 5 are described in detail, and in combination with the above FIGS. 9 to 11, several examples of the display device provided in different scenarios are listed. It should be noted that in the following FIGS. 9 to 11, the first polarizing optical element is a polarizer, the first phase compensation element is a 1 / 4 wave plate, the second polarizing optical element is a polarizer, and the second phase compensation element is a 1 / 4 wave plate. In addition, in FIG. 9, the optical imaging module is an example of a curved mirror, and the window module adopts the structure shown in (b) of FIG. 7. In FIG. 10, the optical imaging module is an example of a catadioptric curved mirror, and the window module adopts the structure shown in (a) of FIG. 7, and in FIG. 11, the optical imaging module is an example of an optical waveguide.

[0074] FIG. 9 is a schematic structural diagram of a first display device 900 for vehicle display provided by the present application. It can be understood that the display device 900 is a specific example of the display device 500 shown in FIG. 5, and the display device 900 can be applied to the vehicle display scenarios shown in FIG. 2 or FIG. 3. As shown in FIG. 9, the display device 900 comprises an image generation module 910, a polarizer 920, a ¼ wave plate 930, a curved mirror 940, and a view window module 950, wherein the view window module 950 comprises a ¼ wave plate 960 and a polarizer 970. The slow axis of the ¼ wave plate 930 and the slow axis of the ¼ wave plate 960 are in-plane orthogonal. The absorption axis of the polarizer 920 and the absorption axis of the polarizer 970 are arranged in-plane parallel. Meanwhile, the polarizer 920 and the ¼ wave plate 930 are arranged on the surface of the image generation module 910, and form an integral module with the image generation module 910. Specifically, when the display device 900 displays a virtual image, the image generation module 910 emits image light to the polarizer 920, the polarizer 920 converts the image light into first linearly polarized light, and emits the first linearly polarized light to the ¼ wave plate 930. The ¼ wave plate 930 converts the first linearly polarized light to generate first circularly polarized light, and emits the first circularly polarized light to the view window module 950. The view window module 950 reflects the first circularly polarized light to generate third circularly polarized light, and emits the third circularly polarized light to the curved mirror 940. The curved mirror 940 reflects the third circularly polarized light to generate second circularly polarized light, and emits the second circularly polarized light to the view window module 950. The second circularly polarized light is transmitted to the ¼ wave plate 960 in the view window module 950, and is converted by the ¼ wave plate 960 to second linearly polarized light which is emitted to the polarizer 970. The polarizer 970 transmits the second linearly polarized light, so that the view window module 950 emits the second linearly polarized light.

[0075] Exemplarily, as shown in FIG. 9, when the polarizer 920 and the polarizer 970 are horizontal polarizers, the polarizer 920 converts the image light into horizontal linearly polarized light, and emits the horizontal linearly polarized light to the ¼ wave plate 930. The ¼ wave plate 930 converts the received horizontal linearly polarized light into left-handed circularly polarized light, and emits the left-handed circularly polarized light to the view window module 950. The view window module 950 reflects the left-handed circularly polarized light to generate right-handed circularly polarized light to the curved mirror 940, and the right-handed circularly polarized light is reflected by the curved mirror 940 to emit left-handed circularly polarized light to the view window module 950. The ¼ wave plate 960 in the view window module 950 receives the left-handed circularly polarized light from the curved mirror 940, and converts the left-handed circularly polarized light into horizontal linearly polarized light. The horizontal linearly polarized light continues to be transmitted through the horizontal polarizer 970, and is finally emitted from the view window module 950 to the human eye, so that the human eye (i.e., the user) views the displayed virtual image through the view window module 950.

[0076] It can be understood that the image generation module 910 in FIG. 9, the present embodiment is not limited, the image generation module 910 can refer to the above description of the image generation module 510 in FIG. 6, and details are not repeated here.

[0077] It can also be understood that in FIG. 9, the horizontal polarized light emitted by the polarizer 920 generates left-handed circularly polarized light through the 1 / 4 wave plate 930, which is only exemplary. This is because the circularly polarized light generated after the horizontal polarized light passes through the 1 / 4 wave plate depends on the angle (45°) between the optical axis of the 1 / 4 wave plate and the direction of the horizontal polarized light, and the rotation direction of the circularly polarized light depends on the material properties of the 1 / 4 wave plate, that is, the two optical principal axes (fast axis and slow axis) with different refractive indices make the phase difference of the two orthogonal polarization components on the horizontal polarized light passing through the 1 / 4 wave plate have ±90°. When the phase difference of the two orthogonal polarization components is -90°, left-handed circularly polarized light is generated, and when the phase difference of the two orthogonal polarization components is 90°, right-handed circularly polarized light is generated. This part of the content can be specifically referred to the optical related principles, and details are not repeated here.

[0078] FIG. 10 is a schematic structural diagram of a second display device 1000 for vehicle display provided by the present application. It can be understood that the display device 1000 is a specific example of the display device 500 shown in FIG. 5, and the display device 1000 can be applied to the vehicle display scenarios shown in FIG. 2 or FIG. 3. As shown in FIG. 10, the display device 1000 comprises an image generation module 1010, a polarizer 1020, a 1 / 4 wave plate 1030, a trans-reflective curved mirror 1040, and a view window module 1050, wherein the view window module 1050 comprises a 1 / 4 wave plate 1060 and a polarizer 1070. The slow axis of the 1 / 4 wave plate 1030 and the slow axis of the 1 / 4 wave plate 1060 are in-plane orthogonal. The polarizer 1020 is an absorbing polarizer, and the polarizer 1070 is a reflective polarizer, and the absorption axis of the polarizer 1020 and the reflection axis of the polarizer 1070 are arranged in-plane parallel. Meanwhile, the polarizer 1020 and the 1 / 4 wave plate 1030 are arranged on the surface of the image generation module 1010, and form an integral module with the image generation module 1010. Specifically, when the display device 1000 displays a virtual image, the image generation module 1010 emits image light to the polarizer 1020, the polarizer 1020 converts the image light into first linearly polarized light, and emits the first linearly polarized light to the 1 / 4 wave plate 1030. The 1 / 4 wave plate 1030 converts the first linearly polarized light into first circularly polarized light, and emits the first circularly polarized light to the trans-reflective curved mirror 1040. The trans-reflective curved mirror 1040 transmits the first circularly polarized light to the view window module 1050. The 1 / 4 wave plate 1060 in the view window module 1050 continues to convert the first circularly polarized light into third linearly polarized light, and emits the third linearly polarized light to the polarizer 1070. Since the polarization direction of the third linearly polarized light is parallel to that of the first linearly polarized light, the polarizer 1070 reflects the third linearly polarized light back to the 1 / 4 wave plate 1060. The third linearly polarized light is converted into third circularly polarized light by the 1 / 4 wave plate 1060, and is emitted to the trans-reflective curved mirror 1040. The trans-reflective curved mirror 1040 reflects the third circularly polarized light to generate second circularly polarized light, and emits the second circularly polarized light to the view window module 1050. The second circularly polarized light is converted into second linearly polarized light by the 1 / 4 wave plate 1060, and since the polarization direction of the second linearly polarized light is perpendicular to that of the first linearly polarized light, the second linearly polarized light continues to transmit the polarizer 1070, and is thus emitted from the view window module 1050.

[0079] Exemplarily, as shown in FIG. 10, when the polarizer 1020 and the polarizer 1070 are horizontal polarizers, the polarizer 1020 converts the image light into horizontal polarized light, and emits the horizontal polarized light to the 1 / 4 wave plate 1030. After the 1 / 4 wave plate 1030 converts the received horizontal linear polarized light into left circular polarized light, the left circular polarized light is emitted to the transflective curved mirror 1040, and the transflective curved mirror 1040 transmits the left circular polarized light to the view window module 1050. The left circular polarized light first passes through the 1 / 4 wave plate 1060 to be converted into horizontal polarized light, and is emitted to the horizontal polarizer 1070, which reflects the horizontal polarized light back to the 1 / 4 wave plate 1060. The 1 / 4 wave plate 1060 continues to convert the horizontal polarized light into left circular polarized light, and emits the left circular polarized light to the transflective curved mirror 1040. The transflective curved mirror 1040 reflects the left circular polarized light to generate right circular polarized light, and emits the right circular polarized light to the view window module 1050. The right circular polarized light from the transflective curved mirror 1040 passes through the 1 / 4 wave plate 1060 again, is converted into vertical polarized light, and is transmitted through the horizontal polarizer 1070 to the human eye, so that the human eye (i.e., the user) views the displayed virtual image through the view window module 1050.

[0080] It should be noted that for the display architecture of the display device 1000, when the polarizer 1020 and the 1 / 4 wave plate 1030 are not added in the light path, part of the image light will directly transmit through the curved mirror and the view window module and directly enter the human eye, so that the virtual image viewed by the user is disturbed. Therefore, the scheme of the present application adds the polarizer 1020 and the 1 / 4 wave plate 1030, and combines the polarizer 1070 and the 1 / 4 wave plate 1060 in the view window module 1050, so that the linear polarized light generated by the polarizer 1020 can be well recovered into linear polarized light after passing through the 1 / 4 wave plate 1030 and the 1 / 4 wave plate 1060, and is all reflected back to the transflective curved mirror 1040 to generate a virtual image by the transflective curved mirror 1040. The scheme does not distinguish the wavelength of the incident image light, and all wavelengths can be perfectly converted into linear polarization. Therefore, the scheme of the present application can also greatly reduce the intensity of the real image directly emitted by the image generation module 1010 in the architecture shown in FIG. 10, avoid the disturbance of the real image to the virtual image, and improve the viewing experience of the user.

[0081] It can be understood that the image generation module 1010 in FIG. 10 is not limited in the present embodiment, and the image generation module 1010 can refer to the description of the image generation module 510 in FIG. 6 above, which will not be repeated here.

[0082] It can also be understood that in FIG. 10, the rotation direction of the circular polarized light generated by the polarizer 1020 after passing through the 1 / 4 wave plate 1030 is also exemplary. This part can be specifically referred to the optical related principle, which will not be repeated here.

[0083] FIG. 11 is a schematic structural diagram of a third display device 1100 for vehicle display provided by the present application. It can be understood that the display device 1100 is a specific example of the display device 500 in FIG. 5, and the display device 1100 can be applied to the vehicle display scenarios shown in FIG. 2 or FIG. 3, or applied to the vehicle display scenario shown in FIG. 4. When applied to the vehicle display scenario shown in FIG. 4, the display device 1100 is a display device in a HUD device, and the window module 1150 is a dust cover in the HUD device, which can be used to reduce stray light, dust, humidity, etc. in the environment, so as to improve the glare of the HUD device, improve the display effect, and protect the internal elements of the device. As shown in FIG. 11, the display device 1100 includes an image generation module 1110, a polarizer 1120, a 1 / 4 wave plate 1130, an optical waveguide 1140, and a window module 1150, wherein the window module 1150 includes a 1 / 4 wave plate 1160 and a polarizer 1170. The slow axis of the 1 / 4 wave plate 1130 and the slow axis of the 1 / 4 wave plate 1160 are in-plane orthogonal. The absorption axis of the polarizer 1120 and the absorption axis of the polarizer 1170 are arranged in-plane parallel. At the same time, the polarizer 1120 and the 1 / 4 wave plate 1130 are arranged on the surface of the window module 1150, and the window module 1150 further includes a three-way film 1180. Specifically, when the display device 1100 displays a virtual image, the image generation module 1110 emits image light to the optical waveguide 1140. The optical waveguide 1140 transmits the image light to the window module 1150. The polarizer 1120 in the window module 1150 converts the image light into first linearly polarized light, and emits the first linearly polarized light to the 1 / 4 wave plate 1130. The 1 / 4 wave plate 1130 continues to convert the first linearly polarized light into first circularly polarized light, and emits the first circularly polarized light to the three-way film 1180. The three-way film 1180 transmits the first circularly polarized light to the 1 / 4 wave plate 1160, and reflects the first circularly polarized light to the 1 / 4 wave plate 1130. For the transmitted first circularly polarized light, the 1 / 4 wave plate 1160 converts the first circularly polarized light into second linearly polarized light, which continues to transmit the polarizer 1170 and is emitted from the window module 1150. For the reflected first circularly polarized light, the 1 / 4 wave plate 1130 converts the first circularly polarized light into third linearly polarized light, which is perpendicular to the polarization direction of the first linearly polarized light.

[0084] Exemplarily, as shown in FIG. 11, when the polarizer 1120 and the polarizer 1170 are horizontal polarizers, the polarizer 1120 converts the image light into horizontal linearly polarized light and emits to the 1 / 4 wave plate 1130. The 1 / 4 wave plate 1130 converts the received horizontal linearly polarized light into left circularly polarized light and emits to the three-way film 1180. The three-way film 1180 transmits the left circularly polarized light from the 1 / 4 wave plate 1130 to the 1 / 4 wave plate 1160. The 1 / 4 wave plate 1160 converts the left circularly polarized light into horizontal linearly polarized light, which continues to transmit the horizontal polarizer 1170 and finally emits from the view window module 1150. It can be understood that when the display device 1100 is used in the vehicle display scene shown in FIG. 2 or FIG. 3 described above, the view window module 1150 emits horizontal linearly polarized light to the human eye, so that the human eye (i.e., the user) views the displayed virtual image through the view window module 1150. When the display device 1100 is used in the vehicle HUD display scene shown in FIG. 4 described above, the view window module 1150 emits horizontal linearly polarized light to the windshield, and the windshield reflects the horizontal linearly polarized light to the human eye, so that the human eye (i.e., the user) views the displayed virtual image through the windshield.

[0085] It should be noted that in the light waveguide display scheme containing the three-way film, due to the reflection property of the three-way film, part of the image light is reflected back to the light waveguide by the three-way film, resulting in the defect that the display image contrast is reduced. However, in the display device 1100 shown in FIG. 11, when the three-way film 1180 reflects the left circularly polarized light to generate right circularly polarized light to the light waveguide 1140, the right circularly polarized light emitted from the surface of the three-way film 1180 will pass through the 1 / 4 wave plate 1130 again, and at the same time, the 1 / 4 wave plate 1130 converts the right circularly polarized light into vertical polarized light, which cannot pass through the horizontal polarizer 1120. Therefore, the display device 1100 also has high image contrast, that is, the horizontal polarizer 1120 and the 1 / 4 wave plate 1130 arranged on the surface of the view window module 1150 have the effect of improving the display effect of the display device.

[0086] It can be understood that the image generation module 1110 in FIG. 11 is not limited in the embodiment, and the image generation module 1110 can refer to the description of the image generation module 510 in FIG. 6 described above, which will not be repeated here.

[0087] It can also be understood that in FIG. 11, the rotation direction of the circularly polarized light generated by the horizontal polarizer 1120 passing through the 1 / 4 wave plate 1130 is also exemplary. This part can be specifically referred to the optical related principle, which will not be repeated here.

[0088] It should be noted that the above Figs. 9 to 11 are part of the embodiments of the present application but not all the embodiments. In addition, when the display apparatuses in the above Figs. 9 to 11 are described, the number of the substrates included in the window module is not limited. The number of the substrates included in the window module can be at least one, i.e., the number of the substrates in the above window module 950, the window module 1050 and the window module 1150 is at least one. When the number of the substrates included in the window module of the display apparatus in the above Figs. 9 to 11 is more than one and the material of the substrates is organic glass, two substrates in each group of the plurality of substrates can be arranged with the polar directions perpendicular to each other based on the description in the above Fig. 8, so as to reduce the color cast of the display picture and improve the quality of the display picture. It can be understood that the display apparatuses in the above Figs. 9 to 11 are described by taking the first polarizing optical element as a horizontal polarizer, the first phase compensation element as a 1 / 4 wave plate, the second polarizing optical element as a horizontal polarizer and the second phase compensation element as a 1 / 4 wave plate as an example, but the present application is not limited thereto.

[0089] Fig. 12 is a schematic view of a cabin of a vehicle according to an embodiment of the present application. As shown in Fig. 12, the vehicle includes a display device 2000 arranged inside a front dashboard. The display device 2000 includes the display apparatus 500 according to an embodiment of the present application, for example, a display device including the display apparatus 900, the display apparatus 1000 and the display apparatus 1100.

[0090] Optionally, in addition to being arranged on the dashboard, the display device 2000 according to an embodiment of the present application can be arranged on other structural devices of the vehicle, for example, a chair back, a vehicle inner wall, an operation table, a processing table, etc., which are not limited herein.

[0091] Optionally, the operation table can be a rescue operation table on an ambulance, a kitchen operation table on a house car, etc., and the processing table can be a bar table on a house car, a dining table in a passenger cabin, an office table, etc., which are not limited herein.

[0092] When the display device 500 is applied in a HUD device, FIG. 13 is a schematic diagram of an optical path 1300 of the display device applied in the HUD device according to an embodiment of the present application. In FIG. 13, the HUD device includes a windshield 1310. Meanwhile, the optical imaging module 540 in the display device 500 includes a first curved mirror 131 and a second curved mirror 132. The view window module 550 is a dust cover. The dust cover includes a second phase compensation element 560 and a second polarized optical element 570. Specifically, the image generation module 510 generates image light and projects the image light to the first polarized optical element 520, the first polarized optical element 520 converts the image light into first linearly polarized light and emits the first linearly polarized light to the first phase compensation element 530. The first phase compensation element 530 converts the first linearly polarized light into first circularly polarized light and emits the first circularly polarized light to the first curved mirror 131. The first curved mirror 131 reflects the first circularly polarized light to generate third circularly polarized light and emits the third circularly polarized light to the second curved mirror 132. The second curved mirror 132 continues to reflect the third circularly polarized light to generate second circularly polarized light to the dust cover. The second phase compensation element 560 converts the second circularly polarized light into second linearly polarized light and emits the second linearly polarized light to the second polarized optical element 570. The second polarized optical element 570 transmits the second linearly polarized light to the windshield 1310, and the windshield 1310 reflects the second linearly polarized light to the human eye, so that the user can see a virtual image generated based on the second linearly polarized light.

[0093] For example, as shown in FIG. 13, when the first polarized optical element 520 and the second polarized optical element 570 are horizontal polarizers, and the first phase compensation element 530 and the second phase compensation element 560 are 1 / 4 wave plates, the image light is converted into horizontally polarized light by the first polarized optical element 520, and then converted into left-handed circularly polarized light by the 1 / 4 wave plate, and then converted into right-handed circularly polarized light by the first curved mirror 131 to the second curved mirror 132, and then reflected by the second curved mirror 132 to generate left-handed circularly polarized light, and then incident to the 1 / 4 wave plate in the view window module 550, and then converted into horizontally polarized light by the 1 / 4 wave plate, and then emitted from the horizontal polarizer in the view window module 550.

[0094] The image generated by the second linearly polarized light emitted from the dust cover can be an augmented reality display image for displaying information such as indication information and navigation information of an external object. Alternatively, it can be a state display image for displaying state information of a vehicle. For example, the state information of the vehicle includes but is not limited to information such as driving speed, driving mileage, fuel quantity, water temperature, and headlight state.

[0095] It can be understood that the vehicle to which the HUD device can be applied includes but is not limited to a car, an airplane, a train, or a ship, etc.

[0096] It can also be understood that the display device in FIG. 13 does not limit the number of substrates included in the window module. The number of substrates included in the window module can be at least one. Meanwhile, in the display device 500 in FIG. 13, the first polarizing optical element is a horizontal polarizer, the first phase compensation element is a 1 / 4 wave plate, the second polarizing optical element is a horizontal polarizer, and the second phase compensation element is a 1 / 4 wave plate, which is an example for description, and the present application is not limited thereto.

[0097] FIG. 14 is a circuit schematic diagram of a display device provided by an embodiment of the present application. As shown in FIG. 14, the circuit in the display device mainly includes a host CPU 1201, an external memory interface 1202, an internal memory 1203, an audio module 1204, a video module 1205, a power module 1206, a wireless communication module 1207, an I / O interface 1208, a video interface 1209, a display circuit 1210, and a modulator 1212. The host CPU 1201 and its peripheral elements, such as the external memory interface 1202, the internal memory 1203, the audio module 1204, the video module 1205, the power module 1206, the wireless communication module 1207, the I / O interface 1208, the video interface 1209, and the display circuit 1210 can be connected through a bus. The host CPU 1201 can be referred to as a front-end processor.

[0098] In addition, the circuit diagram shown in the embodiments of the present application does not constitute a specific limitation on the display device. In other embodiments of the present application, the display device can include more or fewer components than shown, or combine certain components, or split certain components, or different component arrangements. The components shown can be implemented in hardware, software, or a combination of software and hardware.

[0099] The host processor 1201 includes one or more processing units, for example: the host processor 1201 can include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units can be independent devices or integrated into one or more processors.

[0100] The main processor 1201 can also be provided with a memory for storing instructions and data. In some embodiments, the memory in the main processor 1201 is a cache memory. The memory can hold instructions or data that the main processor 1201 has just used or recycled. If the main processor 1201 needs to use the instructions or data again, it can be directly called from the memory. This avoids repeated access and reduces the waiting time of the main processor 1201, thereby improving the efficiency of the system.

[0101] In some embodiments, the display device can also include a plurality of input / output (I / O) interfaces 1208 connected to the main processor 1201. The interface 1208 can include an Inter-Integrated Circuit (I2C) interface, an Inter-Integrated Circuit Sound (I2S) interface, a Pulse Code Modulation (PCM) interface, a Universal Asynchronous Receiver / Transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a General-Purpose Input / Output (GPIO) interface, a Subscriber Identity Module (SIM) interface, and / or a Universal Serial Bus (USB) interface, etc. The above-mentioned I / O interface 1208 can be connected to devices such as a mouse, a touchpad, a keyboard, a camera, a speaker / loudspeaker, a microphone, etc. It can also be connected to physical keys on the display device (such as volume keys, brightness adjustment keys, power on / off keys, etc.).

[0102] The external memory interface 1202 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the display device. The external memory card communicates with the main processor 1201 through the external memory interface 1202 to realize the data storage function.

[0103] The internal memory 1203 can be used to store computer executable program codes including instructions. The internal memory 1203 can include a program storage area and a data storage area. The program storage area can store an operating system, at least one application program required by a function (such as a call function, a time setting function, etc.), and the like. The data storage area can store data created during use of the display device (such as a phone book, a world time, etc.), and the like. In addition, the internal memory 1203 can include a high-speed random access memory, and can further include a non-volatile memory such as at least one of a magnetic disk storage device, a flash memory device, a Universal Flash Storage (UFS), and the like. The main processor 1201 executes various function applications and data processing of the display device by running instructions stored in the internal memory 1203 and / or instructions stored in a memory disposed in the main processor 1201.

[0104] The display device can realize an audio function through the audio module 1204 and an application processor, etc. For example, music playing, calling, etc.

[0105] The audio module 1204 is used to convert digital audio information into an analog audio signal output, and is also used to convert an analog audio input into a digital audio signal. The audio module 1204 can also be used to encode and decode audio signals, such as playing or recording. In some embodiments, the audio module 1204 can be disposed in the main processor 1201, or part of the function modules of the audio module 1204 can be disposed in the main processor 1201.

[0106] The video interface 1209 can receive an externally input audio / video signal, which can be a High Definition Multimedia Interface (HDMI), a Digital Visual Interface (DVI), a Video Graphics Array (VGA), a Display port (DP), etc. The video interface 1209 can also output video externally. When the display device is used as a vehicle display, the video interface 1209 can receive a speed signal and a power signal input by a peripheral device, and can also receive an externally input VR video signal. When the display device is used, the video interface 1209 can receive a video signal input by an external computer or terminal device.

[0107] The video module 1205 can decode the video inputted by the video interface 1209, for example, H.264 decoding. The video module can also encode the video collected by the display device, for example, H.264 encoding of the video collected by the external camera. In addition, the main processor 1201 can also decode the video inputted by the video interface 1209, and then output the decoded image signal to the display circuit 1210.

[0108] The display circuit 1210 and the modulator 1212 are used to display the corresponding image. In the embodiment, the video interface 1209 receives the externally inputted video source signal, and the video module 1205 decodes and / or digitizes the signal and then outputs one or more image signals to the display circuit 1210. The display circuit 1210 drives the modulator 1212 to image the incident polarized light according to the inputted image signal, and then outputs the image light. In addition, the main processor 1201 can also output one or more image signals to the display circuit 1210.

[0109] In the embodiment, the display circuit 1210 and the modulator 1212 belong to the electronic elements in the image generation module, and the display circuit 1210 can be referred to as a driving circuit.

[0110] The power module 1206 is used to provide power for the main processor 1201 and the light source 1200 according to the inputted power (for example, direct current). The power module 1206 can include a rechargeable battery, which can provide power for the main processor 1201 and the light source 1200. The light emitted by the light source 1200 can be transmitted to the modulator 1212 to form an image, thereby forming an image light signal.

[0111] The wireless communication module 1207 can enable the display device to communicate wirelessly with the outside world, which can provide a solution for wireless local area network (WLAN) (such as a wireless fidelity (Wi-Fi) network), Bluetooth (BT), global navigation satellite system (GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (IR), and the like. The wireless communication module 1207 can be one or more devices that integrate at least one communication processing module. The wireless communication module 1207 receives electromagnetic waves via an antenna, frequency-modulates and filters the electromagnetic wave signals, and sends the processed signals to the main processor 1201. The wireless communication module 1207 can also receive signals to be transmitted from the main processor 1201, frequency-modulate them, amplify them, and radiate them as electromagnetic waves via an antenna.

[0112] In addition, the video data decoded by the video module 1205 can be received wirelessly or read from an external memory in addition to being input through the video interface 1209. For example, the display device can receive video data from a terminal device or a car entertainment system through a wireless local area network in a vehicle, and can read audio and video data stored in an external memory.

[0113] The display device described above can be installed in a vehicle. Referring to FIG. 15, FIG. 15 is a possible functional framework diagram of a vehicle according to an embodiment of the present application.

[0114] As shown in FIG. 15, the functional framework of the vehicle can include various subsystems, such as a sensor system 12, a control system 14, one or more peripheral devices 16 (one is shown as an example), a power supply 18, a computer system 20, and a vehicle display system 22. Optionally, the vehicle can also include other functional systems, such as an engine system that provides power for the vehicle, and the like, which are not limited herein.

[0115] The sensor system 12 can include a number of sensing devices that can sense information of a measured quantity and convert the sensed information into an electrical signal or other desired form of information output according to a certain rule. As shown, the sensing devices can include a global positioning system (GPS), a vehicle speed sensor, an inertial measurement unit (IMU), a radar unit, a laser range finder, a camera, a wheel speed sensor, a steering sensor, a gear sensor, or other elements for automatic detection, etc., without limitation.

[0116] The control system 14 can include a number of elements, such as a steering unit, a braking unit, an illumination system, an automatic driving system, a map navigation system, a network time system, and an obstacle avoidance system, as shown. Alternatively, the control system 14 can also include elements such as a throttle controller for controlling the driving speed of the vehicle and an engine controller, without limitation.

[0117] The peripheral device 16 can include a number of elements, such as a communication system, a touch module, a user interface, a microphone, and a speaker, as shown. The communication system is used to realize network communication between the vehicle and other devices other than the vehicle. In actual applications, the communication system can realize network communication between the vehicle and other devices by using wireless communication technology or wired communication technology. The wired communication technology can refer to communication between the vehicle and other devices by using a network cable or an optical fiber, etc.

[0118] The power supply 18 represents a system for providing power or energy for the vehicle, which can include but is not limited to rechargeable lithium batteries or lead-acid batteries, etc. In actual applications, one or more battery components in the power supply are used to provide power or energy for starting the vehicle, and the types and materials of the power supply are not limited.

[0119] A number of functions of the vehicle are controlled and realized by the computer system 20. The computer system 20 can include one or more processors 2001 (one processor is shown as an example) and a memory 2002 (also referred to as a storage device). In actual applications, the memory 2002 can be inside the computer system 20 or outside the computer system 20, such as a cache in the vehicle, etc., without limitation. The memory 2002 can store a number of programs or instructions corresponding to the programs, and the processor 2001 can run the programs or the instructions corresponding to the programs to realize the corresponding functions of the vehicle.

[0120] The processor 2001 can include one or more general-purpose processors, such as a graphic processing unit (GPU). The processor 2001 can be used to run the programs or the instructions corresponding to the programs stored in the memory 2002 to realize the corresponding functions of the vehicle.

[0121] The memory 2002 can include volatile memory, such as RAM, and / or non-volatile memory, such as ROM, flash memory, HDD, or solid-state drive (SSD). The memory 2002 can be used to store a set of program codes or instructions corresponding to the program codes, which are invoked by the processor 2001 to cause the processor 2001 to perform corresponding functions of the vehicle. In the present application, the memory 2002 can store a set of program codes for vehicle control, and the processor 2001 can control the vehicle to travel safely by invoking the program codes. Details of how to control the vehicle to travel safely are described below.

[0122] Optionally, the memory 2002 can store information such as road map, driving route, sensor data, etc. in addition to the program codes or instructions. The computer system 20 can implement related functions of the vehicle in combination with other elements in the vehicle functional framework diagram, such as sensors in the sensor system, GPS, etc. For example, the computer system 20 can control the driving direction or speed of the vehicle based on the data input of the sensor system 12, which is not limited in the present application.

[0123] The in-vehicle display system 22 can include several elements, such as a controller and an in-vehicle display. The controller 222 is used to generate an image (such as an image of VR content) according to a user instruction, and send the image to the in-vehicle display for display. The in-vehicle display can include an image generation module, a window module, and an image generation module, and the passenger can view the target image presented by the in-vehicle display through the window module. Alternatively, the passenger can realize touch interaction with the in-vehicle display through the touch window module. In addition, the functions of some elements in the in-vehicle display system can also be implemented by other subsystems of the vehicle, for example, the controller can also be an element in the control system.

[0124] In the present application, FIG. 15 shows that the vehicle includes four subsystems, the sensor system 12, the control system 14, the computer system 20, and the in-vehicle display system 22, which are only examples and do not constitute a limitation. In actual applications, the vehicle can combine several elements in the vehicle according to different functions to obtain a corresponding subsystem with different functions. In actual applications, the vehicle can include more or fewer systems or elements, which are not limited in the present application.

[0125] Unless otherwise defined, technical terms or scientific terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The above description is provided only to illustrate some embodiments of the present application and should not be taken in a limiting sense. Any modification, equivalent replacement, improvement, etc. made on the basis of the present application should be included in the scope of the present application.

Claims

1. A display device, characterized in that, Comprising: An image generation module, a first polarized optical element, a first phase compensation element, an optical imaging module and a view window module, the view window module comprising a second phase compensation element and a second polarized optical element, the first polarized optical element and the first phase compensation element being located on an optical path between the image generation module and the view window module, the polarization directions of the first polarized optical element and the second polarized optical element being the same, the slow axis of the first phase compensation element and the slow axis of the second phase compensation element being in-plane orthogonal, wherein, The image generation module is configured to output image light. The first polarized optical element is configured to generate first linearly polarized light based on the image light and output the first linearly polarized light to the first phase compensation element. The first phase compensation element is configured to generate first circularly polarized light based on the first linearly polarized light. The optical imaging module is configured to output second circularly polarized light or the image light to the view window module, the second circularly polarized light being generated based on the first circularly polarized light. The second phase compensation element is configured to generate second linearly polarized light based on the second circularly polarized light. The second polarized optical element is configured to transmit the second linearly polarized light. The view window module is configured to output the second linearly polarized light.

2. The display device according to claim 1, wherein The view window module comprises a first substrate and a second substrate, the material of the first substrate and the material of the second substrate being the same, the polar direction of the material of the first substrate and the polar direction of the material of the second substrate being arranged at a right angle.

3. The display device of any one of claim 2, wherein, The material of the first substrate and the material of the second substrate are polycarbonate (PC) or polymethyl methacrylate (PMMA).

4. The display device according to any one of claims 1 to 3, wherein The first polarized optical element, the first phase compensation element and the image generation module are integrated into one whole, wherein The view window module is specifically configured to reflect the first circularly polarized light to generate third circularly polarized light and output the third circularly polarized light to the optical imaging module, the polarization direction of the second linearly polarized light output by the view window module being parallel to that of the first linearly polarized light. The optical imaging module is specifically configured to reflect the third circularly polarized light to generate the second circularly polarized light and output the second circularly polarized light to the view window module.

5. The display device according to any one of claims 1 to 3, wherein The first polarized optical element, the first phase compensation element and the image generation module are integrated into one whole, wherein The optical imaging module is specifically configured to transmit the first circularly polarized light to the view window module and reflect third circularly polarized light from the view window module to generate the second circularly polarized light and output the second circularly polarized light to the view window module. The second phase compensation element is further configured to generate third linearly polarized light based on the first circularly polarized light, and reflect the third linearly polarized light to the second polarized optical element, the third linearly polarized light is parallel to the polarization direction of the first linearly polarized light, and generate third circularly polarized light based on the third linearly polarized light, and emit the third circularly polarized light to the optical imaging module; The second polarized optical element is further configured to reflect the third linearly polarized light to the second phase compensation element; The second linearly polarized light emitted by the view window module is perpendicular to the polarization direction of the first linearly polarized light.

6. The display device according to any one of claims 1 to 3, wherein The first polarized optical element, the first phase compensation element, and the view window module are integrated into one whole, and the view window module further comprises a three-way film, the three-way film is arranged between the first phase compensation element and the second phase compensation element, wherein The optical imaging module is specifically configured to transmit the image light to the view window module; The three-way film is configured to transmit the first circularly polarized light to the second phase compensation element, and reflect the first circularly polarized light to the first phase compensation element; The first phase compensation element is further configured to generate third linearly polarized light based on the first circularly polarized light, the third linearly polarized light is perpendicular to the polarization direction of the first linearly polarized light; The second linearly polarized light emitted by the view window module is parallel to the polarization direction of the first linearly polarized light.

7. An in-vehicle system characterized by comprising: The display device according to any one of claims 1 to 6 and a seat, The seat is configured to allow a user to sit on the seat to watch the image displayed by the display device.

8. A vehicle, characterized by The display device according to claim 6 and a windshield glass, The windshield glass is configured to reflect the second linearly polarized light from the display device to a human eye.

9. A vehicle, characterized by The display device according to any one of claims 1 to 6 or the vehicle-mounted system according to claim 7.

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